Autodesk Revit MEP

[#1]

Hi all.

Can any one explain to me why the panel schedule for a single phase panel shows two phase columns, "A" & "B"...

Surely for a single phase system there should only be one phase column.

[#2]

No easy answer - a matter of historical predicence.

 In the US, with two hots 'A' and 'B' and a Neutral 'N' is considered "single-phase":

1 - Some say it's to differentiate it from old 2-phase systems where the phase angles were 90 degrees apart

2 - Because you only get one sine waveform when you put an oscilloscope across hot-hot or hot-neutral.

3 - Because you can only connect single-phase loads to it.

If you use a search engine you'll get another 100 answers.  <G>

[#3]

In the US single phase means either 120v 1POLE -OR- 208v 2 POLE.  It is very confusing I know and don't personaly like using those terms.  It should be more specific, and most engineers know that.

Programs should be more specific, but I think the programming going on in in electrical is FAR from being very engineer friendly.

[#4]

Thanks a lot.

Im in South Africa and we very seldom, if ever, use a 2-pole panel. We mainly use a single phase or three phase panels. The distribution systems we use are either 230v single phase or 400v / 230v three phase. So we either have one phase column or three phase columns on the schedules.

Im also a draughtsman, and im just trying to set a set of standards for the company so when we introduce the program fully into our office, its easier to use by the other draughtsman.

Thanks a loyt for the help, its made some things very clear to me.

[#5]

The explanations by the US guys have also helped me understand the response from the UK Autodesk office. Their response was that "In the US there was no requirement for only a single column schedule so that is why they haven't done it."

Surely it is a simple task to add another tick box in the panel schedule options to ignore/hide the last two columns. Also noticed that when trying to do a "Rest of the World" single phase panel schedule, the loads and phase start to get confused by circuiting "By Phase".

[#6]

It shouldn't have been an issue to place a simple tick box.

There is how ever an option to hide the phase columns, which in fact would make sense, because even if you have one phase or three phase the total load should be the same? correct me if im wrong, I dont know much about Loads on boards.